subspecialty

/sʌbˈspɛʃəlti/
noun
  1. A specific area of expertise within a larger profession or field.
    • She chose a subspecialty in forensic accounting because she loved solving puzzles.
    • The hospital is known for its subspecialty in treating rare childhood cancers.
    • Cardiology is a subspecialty of internal medicine.
Synonyms
What does "subspecialty" mean? | whatsthatwordmean | whatsthatwordmean